Turris 1.1, TOS 5.1.7 HBS
Connected computers sometimes start having issues with DNS. Pinging 220.127.116.11 wors but pinging www.seznam.cz does not work. Rebooting router helps sometimes.
What i found out always immediately helps is to go to ReForis - DNS and select a different DNS provider. It does not matter which one I select, doing the change and save immediately fixes the problem. I have DNS forwarding on and i switched off the DNSSEC (did not help).
It happened today and two days ago. It is not very frequent but very annoying. Any idea what to do ? Let me know what to check when it happens again.